The Tucson Culinary Festival isn't until October, but tickets are available now. The festival is taking place at new venues this year, which should freshen things up a bit.
The festival is broken into three events: The World Margarita Championship, the Reserve Tasting and the Grand Tasting. The margarita championship takes place in the courtyard of the Tucson Museum of Art this year, and the tastings take place at Casino del Sol. More information and tickets are available over here.
I'm not much for food festivals, but I attended these events last year and had a very good time. The tickets can seem a bit pricey, but don't forget that they include tastes of food by dozens upon dozens of restaurants, plus a bevy of wine samplings. I only made it to about half of the booths last year and left bewildered by the sheer magnitude of what was available.